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Description

Message contains use of the fenc.com open redirect. This has been exploited in the wild.

References

No references.

Sublime Security
Created Oct 8th, 2024 • Last updated Aug 5th, 2025
Source
type.inbound
and any(body.links,
        .href_url.domain.root_domain == "fenc.com"
        and .href_url.path =~ "/redirector.aspx"
        and regex.icontains(.href_url.query_params, 'y=(?:https?|(?:\/|%2f)(?:\/|%2f))')
        and not regex.icontains(.href_url.query_params, 'y=[^\&]*fenc\.com') 

)
and not sender.email.domain.root_domain == "fenc.com"

// negate highly trusted sender domains unless they fail DMARC authentication
and (
  (
    sender.email.domain.root_domain in $high_trust_sender_root_domains
    and not headers.auth_summary.dmarc.pass
  )
  or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)
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